7. Configure SSH LoginGraceTime Parameter
On AIX systems, the OpenSSH parameter LoginGraceTime by default is commented
out, and the default behavior of OpenSSH on AIX can sometimes result in timeout
errors. To avoid these errors, complete the following procedure:
7.1. Log in as root.
7.2. Using a text editor, open the OpenSSH configuration file /etc/ssh/sshd_config.
7.3. Locate the comment line #LoginGraceTime 2m.
7.4. Uncomment the line, and change the value to 0 (unlimited). For example:
LoginGraceTime 0
7.5. Save /etc/ssh/sshd_config.
7.6. Restart SSH.

8. Setting priviledge to Oracle ASM Luns
Same to Solaris, HP-Unix. Remember, when you've got failure of ASM configuration, you need to flush out the disk's slice/partition by OS command "dd". And the slice/partition/LUN allocated from storage to IBM, has got different first alphabet to other platform. The alphabet begins by "r", example:

9. Enable simultaneous access to a disk device from multiple nodes
To enable simultaneous access to a disk device from multiple nodes, you must set the appropriate Object Data Manager (ODM) attribute, depending on the type of reserve attribute used by your disks. The following section describes how to perform this task using hdisk logical names

8.1. determine the reserve setting your disks use, enter the following command,where n is the hdisk device number

# lsattr -E -l hdiskn | grep reserve_

The response is either a reserve_lock setting, or a reserve_policy setting. If the attribute is reserve_lock, then ensure that the setting is reserve_lock = no. If the attribute is reserve_policy, then ensure that the setting is reserve_policy = no_reserve.

8.2. If necessary, change the setting with the chdev command using the following syntax, where n is the hdisk device number:

8.3. Enter commands similar to the following on any node to clear the PVID from each disk device that you want to use:

# /usr/sbin/chdev -l hdiskn -a pv=clear

When you are installing Oracle Clusterware, you must enter the paths to the appropriate device files when prompted for the path of the OCR and Oracle Clusterware voting disk. For example: /dev/rhdisk10

9.Configure Shell Limits
9.1. Add the following lines to the /etc/security/limits file:

9.2.Enter the following command to list the current setting for the maximum number of process allowed by the Oracle software user:

/usr/sbin/lsattr -E -l sys0 -a maxuproc

If necessary, change the maxuproc setting using the following command:

/usr/sbin/chdev -l sys0 -a maxuproc=16384

10. Configure User Process Parameters (Verify that the maximum number of processes allowed for each user is set to 2048 or greater)
Enter the following command:

# smit chgsys

Verify that the value shown for Maximum number of PROCESSES allowed for each user is greater than or equal to 2048. If necessary, edit the existing value.
When you have finished making changes, press Enter, then Esc+0 (Exit) to exit.

11. Configure Network Tuning Parameters:
To check the current values of the network tuning parameters:

# no -a | more

If the system is running in compatibility mode, then follow these steps to change the parameter values:

Enter commands similar to the following to change the value of each parameter:

# no -o parameter_name=value

For example:

# no -o udp_recvspace=655360

Add entries similar to the following to the /etc/rc.net file for each parameter that you changed in the previous step:

For the ISNO parameter tcp_sendspace, use the following command to set it:

# ifconfig en0 tcp_sendspace 65536

By adding these lines to the /etc/rc.net file, the values persist when the system restarts.

12. Automatic SSH configuration
By default, OUI searches for SSH public keys in the directory /usr/local/etc/, and ssh-keygen binaries in /usr/local/bin. However, on AIX, SSH public keys typically are located in the path /etc/ssh, and ssh-keygen binaries are located in the path /usr/bin. To ensure that OUI can set up SSH, use the following command to create soft links:

# ln -s /etc/ssh /usr/local/etc
# ln -s /usr/bin /usr/local/bin

In rare cases, Oracle Clusterware installation may fail during the "AttachHome" operation when the remote node closes the SSH connection. To avoid this problem, set the following parameter in the SSH daemon configuration file /etc/ssh/sshd_config on all cluster nodes to set the timeout wait to unlimited:

With Oracle Clusterware 11g release 2, Oracle Universal Installer (OUI) detects when the minimum requirements for an installation are not met, and creates shell scripts,
called fixup scripts, to finish incomplete system configuration steps. If OUI detects an incomplete task, then it generates fixup scripts (runfixup.sh). You can run the fixup script after you click the Fix and Check Again Button.

19. In the installation progressing, when root.sh at node 2, can the error such as "CRS appear in node 1, did not attemp to stop cluster, re-join cluster, by pass and continue installation.
- If Xterm did not occur, then do: $ export ORACLE_TERM=dtterm
- Manually export ORACLE_BASE, ORACLE_HOME when make an installation before running runInstaller.sh
- If /tmp is too small <500MB, then make a private directory point to other directory, change owner to grid, oracle user, example: